Rotatable article gripping chuck



Nov. 28, 1944. H. F. PHILLIPS ROTATABLE ARTICLE GRIPPING CHUCK Filed Oct. 31, 1941 Fig. 7 is a view in section taken along the line 'I'! of Fig. 6; and v Fig. 8 is a view on an enlarged-scale illustrating a further modified form of a bowling pin-engagingdisc.

The machine of the present invention is designed to recondition bowling pins such'as the bottle pin l0 illustrated in Fig. 1 of the drawing; A somewhat shorter type, known as a duck. pin,.,

and a somewhat longer type, known as a candle pin, may also be reconditioned by the-use of the v present machine. illustrated herein as they are well-known types. Regardless of the type of pin, each type of pin isprovided with asupporting base 12 and a longitudinal or axial, cylindrical bore or hole-l4. The base I2 is fiat or preferably slightly dished or concave so that the outer edge part only of the base I2 engages the floor to form a, stable support for the pin. During use, the bottom part ofthe pin becomes damaged, as splintered, indented, crushed and the like, and the machine is used to recondition the surfaces by cutting off the damaged material and providing'a new surface.

The pin conditioning -machine of the-present invention, as illustrated herein, includes a fiat horizontal base I6 formed of -metal 'or other suitable rigid material. The left-hand end part of the base 16 is provided With'an'electric-motor l8 which is fixed to the base-by suitable bolts or other fastenings-2ll; The electric motor I8 is provided with a shaft 22 extending along" the longitudinal axis'of the base l6, the motor and its accessories forming theheadstock of the machine. The other end part of the'base l6 has socured thereto by a suitable bolt 24 and aligning pin (not shown) a tail stock comprising a bracket 26 provided with a pair of vertically extending horizontally spaced arms 28 and 30, the upper end parts of the front and rear portions' of the arms 28 and30-being provided with aligned openings for slidablyreceiving a pair of horizontally-disposed parallel slides or bars 32 one of which is illustrated in Fig. 1. The inner ends of the slides or bars 32 are fixed to a bowling pin base support-'- ing mechanism 34. 1

Thebase supporting mechanism 34 comprises, as shown in Fig. 1, a vertically. disposed casting 36 fixed to the left hand ends of the bars 32. The casting 36 between the bars 32- is provided with means for receiving a boring tool 38 which is fixed in position on the casting 36and-has its center disposed in alignment with the axis of rotation of theshaft 22 of the motor 1.8-. Thecasting 3B is also provided with asubstantially vertically extending recess receiving a'slide 40 which at its lower. end carries a laterally. extending bracket 42 to whichis rigidly secured the base cutting or refinishing tools 44.. The slide 40 is arranged to be moved upwardly and to move its refinishing tools into engagement with and across the bottom sur face of'the pin lntoremove the damaged material therefrom and'to true the face thereof.

The slide 40 is connectedthrough suitable connections to a handle 46 which when moved by the operator moves the re-finishingtools 44 upwardly and into engagement with the pin H). A spring 48 is provided, which is connected at one :end to the slide.40 and at its 'other end to the casting 36. ,Thus. when the handle146 isreleased. the

These types, however are not manuallyrotating thescrew. The screw 52 extends toward the left and is threaded in an open.- ing formed in the right hand vertical supporting J member 30. Thus, when the handle 54 is rotated the bowling tool 38 and the refinishing mechanism carried by the left hand ends of the rods 32 is moved toward and. into the opening l4 formed in the base of the bowling pin I 0.

Thus, when the boring tool 38 has been inserted into the base of the pin the desired distance, the refinishing tools are moved upwardly into cutting engagement with the work by manipulation of the handle-46. Thus, the base supporting mechanism 34 is efiectivenotonly to support the bowling pin for rotational movement but also, upon manipulation by the operator, to reface or in my abovementioned co-pendingapplication.

With the end-conditioning mechanism herein describedyit is necessary that .the bowling pin not only be rotated but in addition be heldagainst axial displacementtboth toward and away from the said mechanism and this invention provides a chuck that accomplishes these results and also one that grips and releases ,the work quickly and without objectionable ma'rring of the work.

The chuck engages the-head end part 'll lq. of the bowling pin and includes 'a conical or. cupshaped member 56open'. at the endfacing' the tail stock and having an internal recess or bore 51 that has a tapered or conical side wall 58-converging toward the motor. and toward. a hub 59 that has a shaft passagefill co-a'xial with thetapered side wall, the hub having a set screw .6! which fixes thechuck to. the motor, shaft both against rotation and axial movement independently thereof. I It is understood thatthe motor I shaft is held against undue axial movement by the motor frame and its bearings. The opening of the recess 5'! is at least as large as the maximum diameter of .the hea'd ,Hla of the bowling pin so that the head canenter the recess'and engage the tapered side,wall"58 and be centered thereby. The-open end. of the recess '51 issur-i rounded by a radially outstanding-flange .62 integral with the chuck body. Said flange is pro vided with a plurality of "axially-projecting bosses 63 against which the radial wall 64. of a cover 65 is seated, the cover being secured in the aforesaid relation by rivets 66 passed therethrough and through said bosses Saidwall' 64 is providediwith anfiixial opening commensurate di r and i ned. w th he-o eni in h chuck od :The cqveris nr v d d-w t c nr,

The right hand end portion Y of the screw52 is provided with a hand wheel for true the end of a damaged bowling tdtlcaiiwau ii that-overlies landicovers itheiradiai space Ybetweentsaid bosses rcloselysurrounds a part'otzsaidioutstanding zflange. 62. T

ii-She covermi and hange 162 cooperateito pro-'- wideia heusingirdr inwardly opening i channel $3501 a plurality. of chuck dogs, v herein three, ='equiangularly disposed in said housing betweensaid bosses randvconsisting of zplatespralevers :68 sub- 'stantially coeextensive inthicknessfwith the axial space between said .tflange 52 .and eover' 65 at theiplates and pivoted at itheirrupper middle parts on rivets r539 carried :by. saidsilange #and housing. Bearingm dswllaofttherlange .S-Ziform'rbmad supports IffOI' :rthe levers use "that they =can .flllm 'mthoutmbecoming :displa ced -zaxially. .Compression springs :l-D vb'earing against the. cylindrical wall imlthe modificatien Rigs. 11rte15,iin-

elusive, it as rnecessany that pivotal movement mfthezmembers r68 into and out of .g'rippingmngagement with :the bowling mm 2:! maintained 'at .all times. It is apparent that the Ln'entni'mgal action a: the 'chuckfl will cause wood dust and other waste. material "to he thrown against the inner wall 161 .oi the chuc'kcand as a result this space will enned with waste material to. such ententthatmovement or the member fl may be prevented. In-worder to avoid this dimculty. and toiinsure thatthe member 16815 free for W otal movement at all times, a senesofropenings t 69a is provided to permit access to :the space het l 40f saidicover and ragainst :EIlfl parts of said plates, Fig. :urge :said plates *constantlyrioraotaitionzin a counterclockwise direction :andhence,

when :the chuck lis not in ruse, hold the sopposite endsrof said {plates -against said wall. In this positionvtheaunder face :H of eachwplate is more 'or less tangentialto the'axis of the chuck. Each spur J 2 that projects approximately :at right tangles \to its associated face "1|; the pins ib'eing pointed to penetrate the head of the-bowling cpin of said :plates ,.has fixed ithereon .a driving min i or r and:.-form.eiiectivewdriving connections between the :bowlingpin; and the :body "of the chuck.

When the head of a bowling ipinlisrinserted in the .*chuck by movement axially, the driving pins 12 arepushed or. cammed in a clockwise direction fromthe position illustrated in. Fig. 2

to that illustrated in Fig.4. This can be done without rotating the bowling pin if the head is rounded as illustrated, or by rotating the bowling pin counterclockwise relative to the chuck. The

bowling pin is inserted in the chuck preferably until the head abuts against the tapered wall .58 of the recess 51 and the head becomes centered in the chuck. The driving spurs or pins I 12 are then in contact with. the surface ofthe bowling pin and are inclined in the direction of .rotationof the chuck. When the chuck is rotated, or whenthebowling pin is rotated clockwise and the chuck is held stationary the driving pins catch and imbed into the bowling pin as illustrated in Fig. 5, the driving pins approaching more nearly into the radial line through the center of the bowling pin and the pivot 69 of the chuck plate. i

With this arrangement, the drive between the chuck and the bowling pin is positive and nonslipping, as any tendency. toward slipping causes the driving pins to imbedstill further in the bowling pin. The driving pins are longenough l and the angle of swing thereof from a bowling pin disengaging position to a driving position is enough for the accommodation of bowling pins having as great a range of head diameters as will be encountered in the usual alley.

Release of the bowling pin from the chuck is secured by rotating the pin counterclockwise relatively to the chuck body whereupon the pins roll out of their indentations in and disengage the bowling pin. No particular amount of force is necessary to be applied to the bowling pin to disengage it from the chuck as the drivingpins in effect pivot on the bowling pin and about their pivots 69 and thus roll out of engagement with little friction.

Since the driving plates 68 are held in the chuck against axial displacement, the driving pins 12 also hold the bowling pins against axial displacement. i

tween each of the members and the peripheral wall @6 1. :As; shown -mostfi-clearly F in JFig. :2, tithe openings ffiliaare' 'rorrnedyin the eover plate I i on either side of the pivot-pint!) "for the member 268. These openings aretsufilciently large to permi t the operator to insert therein a thin rodrt'o loosen the lodged waste material and tor ermit its removal. Theopeningsffi9a alsoipreventtrapid accumulation sof "waste material Jab out the members'IiB since imo'stof the material is :thrown out ofrthe openings and thusit is not necessary to stop :thefchuck-to remove the waste material excent :at .relatively longiintervals. The openings 69a "also provide convenient inspection openi-ngs which enable the operator: with a minimumefiort to determine "whether or not sufficientwaste unaiterial has"accumulated behind.rthe members 1.88

to prevent free pivotal movement of the members. The modification illustrated in Figs. 6 and'l of the drawing is the same as that described and. claimed in my co-pending application Serial No. 316,384, filed January 30, 1940, which has been referred to above. As shown best in Fig. 6,

the chuck it is hollow and is internally tapered as previously described to receive the head end of the bowling pin Ill. The diameter of the opening of the chuck 18 is substantially equal to the maximum diameter of a head portion of the pin l0. Thus, th head of the bowling pin Hi can engage the inside taperedwall of the chuck l8 and be centered thereby with respect to the axis of rotation of the shaft of the motor-I8. The

chuck 18 isprovided with a plurality of wheels 3 or discs 80 whichare located in openings 82 formed in the marginal edge portion. of the chuck 18 adjacent to the open end thereof. The

wheels 80 are located at the same acute angle to the axis of rotation of the chuck. l8 and are rotatably mounted on pins 86 which are driven,

3 through and held in holes bored from the open end of the chuck. The disc are provided with relatively sharp 1 peripheral pin-engaging edge portions and operate as screwsections to imbed .into the outer surface of and toforce the end of the bowling pin against the inner face of the cup. The discs 80, however, being rotatable permit removal of the bowling pin In from the chuck 18 readily when the chuck 18 is held stationary and thebowling pin I0 isrotated in the direction of rotation of the motor l8 since the discs merely;

travel in the grooves previously made. The discs 80, instead of having a continuous periphery, mayhave a series of teeth or spurs 8 8 as' is illustrated with the modified form of disc 90 of Fig. 8, each tooth in contact with a bowling pin indenting into the surface thereof to drive thepin and rolling freely out of the, indentations in releasing the pin. It is evident from the above that the chuck 18 and the boring tool-supportingmechanism 34 are so arranged that the bowling pin I0 may readily be inserted in the chuck 18 and the boring tool '38 inserted in a central opening [4 formed in the base end l2 of the bowling pin. l0 toinsure that the bowling pin [0 will be rotated about its geometric longitudinal axis. 'The chuck 18 also holds the bowling pin l0 against axial displacement. i

Having thus described my invention, what I claim as new and desire to secure by Letters Patent of the United States is: I

1, A chuck comprising a hollow work receiving member and means movably mounted interiorly I spur being arranged and adapted to pierce the Work piece upon relative rotation of the said member and work piece in one direction, thereby to lock thesaid member and work piece against further relative rotation in the same direction and against movement of the work piece axially of the chuck. a r '2. A chuck comprising a hollow work receiving member and means movably mounted interiorly of said member positioned in the path of an entering work piece and movable thereby in direction permitting reception of the work piecelin said member, said meanscomprising a plurality of circumferentially disposed work gripping ele ments pivotally mounted interiorly of said member for swinging movement generally cross-wise of thelongitudinal axis of the'chuck, each said element having aconical driving spur of substantial length having a conical surface faoingzthe entrance to the chuck in position to be engaged pierce the workpiece upon relative rotation of the said' member and work piecein one direction, thereby to lock the said member and work piece against further relative rotation in the same di rection and against movement of the Work piece axially of the chuck.

,HAROLD F. PHILLIPS. v 

